Strake-weld pipe



(N0 Mow.)

J. G BAYLES.

STRAKB WELD PIPE.

No. 470,738. Patented Mar. 15, 1892.

W. (i W am &.

UNITED STATES PATENT OFFICE.

JAMES .o. ,BAYLES, OF EAST ORANGE, NEW JERSEY.

STRAKE-WELD ,PIP-E.

' sPEcIEIcA'rmN forming part of Letters Patent 310.470,?88, date March 15, 1892. Application as February 26. 1891. mm Io. 382,804; on model.)

To all whom'it may concern East Orange, New Jersey, have invented a certain Improvement in Strake-Weld Pipes, of which the following is a specification.

This invention consists of a spirally-wound strip of weldable sheet metal having the contiguous edges of its successive convolutions secured to each other by the welding thereto of an overlapping spiral strake of weldable metal. There is thus produced a spirally welded pipe the interior of which is substantially smooth by reason of the absence therefrom of the inwardly-projecting spiral shouL- der which is present when the meeting edges of the successive convolutions of a spirallywound strip are overlapped and welded directly to each other.

The accompanying drawings of a section of spirally-welded pipe containing the improvement are as follows:

Figure l is an isometrical perspective. Fig. 2 is a transverse section. tudinal section.

The drawings represent a spirally-welded pipe, thegreater portion of the shell of which is composed of a spirally-wound strip A, of

' sheet metal, havingthe meeting edgesa and a of its successive convolutions in contiguity but not necessarily in actual contact 'with The successive convolution's of the strip A are secured to each otherbyhaving the portions of the metal adjoiningtheir meeting edges welded to a spirally-superimposed'metaliic strake B. a The pipe is thus made by uniting two originally-separate strips of sheet metal, a relatively wide strip, and a Fig. 3 is a longi-' relatively narrow strip or strake. The spiral joint or seam is composed of three membersto wit, the overlapping strip B and the metal adjoining the lneetingor contiguous edges a and a of the successive convolutions of the spirally-wound strip A. In producing this pipe the members of the seam will usually be separately heated and brought into suitable juxtaposition and welded by a machine substantially the same as that heretofore used in manufacturing spiral-weld pipe from a single strip of sheet metal wound spirally, with the meeting portions of its successive convolutions overlapped and welded directlyto each other. 7 V

What is claimed as the invention is- 1. A spirally-welded pipe composed of 'a spirally-wound relatively wide strip of sheet metal, with a relatively narrow spiral strip or strake of sheet metal superimposed upon and.

welded to the metal adjoining the contiguous edges of the successive convolutions of said relatively wide strip.

2. The herein-described strake-weld sheetmetal pipe, the welded seam of which is composed of three members, two of which members consist, respectively, of the portions of metal adjoining the contiguous edges of the -successive convolutions of a spirally-wound relativcly wide stripof sheet metal and the third of a spirally-superimposed relatively narrow strip or strake of sheet metal.

. JAMES o. nAYLEs.

Witnesses:

I ALEXANDER DEVINE,

J. E. BUENs. 

